At the grand old age of 90, Lonesome George, a giant tortoise from the Galapagos Islands, suddenly got interested in the opposite sex:

A Pinta Island tortoise, George had showed little interest in sex during 36 years in captivity. At 90, George is in his sexual prime and his low libido even raised tabloid-like rumors the 198 pounds (90 kilograms) creature preferred other males. After trying almost everything from artificial insemination to having George watch younger males mate, his keepers had nearly lost hope. But his new-found libido has raised hopes he could save his subspecies from extinction.